JP4724804B2 - Track sound absorbing material and track sound absorbing construction method - Google Patents

Description

The present invention mainly relates to a sound-absorbing material for a track that improves the sound absorption coefficient in a track such as a railroad, and a sound-absorbing method for a track.

Conventionally, railroad tracks have ballasts spread on the roadbed, concrete sleepers are laid, and rails are laid on the sleepers to stabilize the track. This track configuration has been used for a long time as a basic configuration of the track because it has advantages such as low track laying costs and easy construction when changing wiring.

However, every time a train passes through the track, the rail surface sinks slightly, and daily maintenance and inspection activities are required to repair the track error that occurs. Furthermore, the crushed stone which comprises a track may collapse | crumble by the vibration generate | occur | produced when a train passes a track.

In order to prevent the crushed stone from collapsing due to the train vibration generated when these trains pass along the track, a ballast that is called a road bed stabilizer is applied to the crushed stone surface to harden the ballast surface. Examples of the stabilizer include a one-pack type polyurethane resin and a one-pack type epoxy resin. These are adhesives that are adhesively hardened at room temperature, and when sprayed from above the ballast, they penetrate into the gaps between the ballasts and act to bond and solidify the ballasts.

Further, as a conventional technique, a stabilizer such as a rapid-curing or ordinary-curing cement grout material, a bituminous emulsion, or a cement bituminous grout material disclosed in JP-A-6-108401 is dispersed or injected. There is a road bed stabilization method characterized by
Japanese Patent Laid-Open No. 6-108401

However, the conventional one-pack type adhesive and the various bed stabilizers that consolidate the grout as disclosed in Patent Document 1 described above stabilize the track by solidifying the ballast. Is effective, but the gap between the ballasts is filled with the one-pack type adhesive or various kinds of the above-mentioned stabilizers. There was a bottleneck in which the effect of absorbing train noise was diminished by the presence of the air gap, and the sound absorption effect was impaired. Therefore, the present invention, as a binder resin, at least one kind of resin selected from a moisture curable polyurethane resin and a one-part curable epoxy resin, inorganic particles, sandstone as an aggregate having a particle diameter of 2.5 mm or less, Use at least one kind selected from seto crushed stone No. 3, peridotite, G light No. 2, glassy filler using waste glass raw material, binder resin: inorganic particles = 1: 5 to 1:18 (volume) Ratio), the mixture was preliminarily mixed with a stirrer, and the mixture was spread on a ballast (roadbed crushed stone) assuming an orbit, the surface was lightly pressed and flattened, and the thickness formed on the ballast (roadbed crushed stone) was 10 mm to as the trajectory of the sound absorbing material and a binder resin, characterized in that the formation of the ballast backing layer of 30 mm, the moisture-curable polyurethane resin, the less is selected from a liquid curable epoxy resin One or more kinds of resins are selected from inorganic particles, sandstone, seto crushed stone 3, No. 3, Glite 2, and glassy fillers using waste glass materials as aggregates with a particle diameter of 2.5 mm or less. Use at least one or more types, binder resin: inorganic particles = 1: 5 to 1:18 (volume ratio), pre-mix with a stirrer, and spread the mixture on ballast (roadbed crushed stone) assuming an orbit The ballast sound absorbing layer having a thickness of 10 mm to 30 mm formed on the ballast (roadbed crushed stone) by lightly pressing the surface, and the mixture as the material of the ballast sound absorbing layer is placed on the ballast (roadbed crushed stone) The ballast sound-absorbing layer is formed by applying an appropriate pressure to the upper surface of the ballast sound-absorbing layer by moving the earth discharging plate at a constant speed after being spread and moved on the track at a constant speed with an inclined drop container. When That provides sound absorption engineering process trajectory, have developed sound absorption of method of high compared to dramatically superior sound absorption coefficient into orbit using the ballast before measures ballast and trajectory track bed to elicit sound absorbing effect.

The purpose of the present invention is to solve this problem, and as a result of earnest research, the present inventors have developed a sound absorbing material for a track and a sound absorbing method for a track. It is established from.

The invention according to claim 1 is an aggregate having a particle diameter of 2.5 mm or less as an inorganic particle of at least one resin selected from a moisture curable polyurethane resin and a one-component curable epoxy resin as a binder resin. At least one selected from sandstone, ceto crushed stone No. 3, peridotite, G light No. 2 and glassy filler using waste glass raw material is used, and binder resin: inorganic particles = 1: 5 to 1:18. (Volume ratio) Pre-mixed with a stirrer, sprayed the mixture onto ballast (roadbed crushed stone) assuming the orbit, the surface was lightly pressed and flattened, and the thickness formed on the ballast (roadbed crushed stone) A sound absorbing material for an orbit characterized by forming a ballast sound absorbing layer of 10 mm to 30 mm .

The invention according to claim 2 is an aggregate having a particle diameter of 2.5 mm or less as an inorganic particle of at least one resin selected from a moisture curable polyurethane resin and a one-component curable epoxy resin as a binder resin. At least one selected from sandstone, ceto crushed stone No. 3, peridotite, G light No. 2 and glassy filler using waste glass raw material is used, and binder resin: inorganic particles = 1: 5 to 1:18. (Volume ratio) Pre-mixed with a stirrer, sprayed the mixture onto ballast (roadbed crushed stone) assuming the orbit, the surface was lightly pressed and flattened, and the thickness formed on the ballast (roadbed crushed stone) It is a ballast sound absorbing layer of 10 mm to 30 mm, and the mixture as the material of the ballast sound absorbing layer is dispersed on the ballast (roadbed crushed stone) by moving it on the orbit at a constant speed with an inclined falling container and discharging the soil. Adding appropriate pressing an upper surface of the ballast backing layer by moving at a constant speed which is sound absorbing engineering process trajectory, characterized in that to form the ballast acoustical layer.

Since the sound absorbing material for a track and the sound absorbing method for a track according to the present invention have the above-described configuration, the following effects can be obtained.
That is, according to the first aspect of the present invention, as the binder resin, at least one resin selected from a moisture curable polyurethane resin and a one-component curable epoxy resin is used as the inorganic particles, and the particle diameter is 2.5 mm or less. As the aggregate, at least one selected from sandstone, ceto crushed stone No. 3, peridotite, G-lite No. 2, glassy filler using waste glass raw material is used, and binder resin: inorganic particles = 1: 5 ˜1: 18 (volume ratio), pre-mixed with a stirrer, spray the mixture onto ballast (roadbed crushed stone) assuming trajectory, lightly press the surface to flatten, and onto ballast (roadbed crushed stone) An orbital sound-absorbing material characterized by forming a ballast sound-absorbing layer having a thickness of 10 mm to 30 mm is provided.
Since such a configuration is adopted, since a one-component curable organic material is used as the binder resin, there is an effect that the curing time of the binder resin is short and the maintenance management time in the track can be shortened. . In addition to enhancing the sound absorption effect on the track, it maintains the solid state between the ballasts, stabilizes the roadbed, and contributes to noise suppression and environmental conservation. Conventional ballast (roadbed crushed stone) As compared with the case of only the above, there is an effect that the sound absorption rate is remarkably improved and a uniform ballast sound absorption layer can be efficiently formed.

According to the second aspect of the present invention, as the binder resin, at least one resin selected from a moisture curable polyurethane resin and a one-component curable epoxy resin is used as the inorganic particles, and the bone having a particle diameter of 2.5 mm or less. As a material, at least one selected from sandstone, ceto crushed stone No. 3, peridotite, G light No. 2 and glassy filler using waste glass raw material is used, and binder resin: inorganic particles = 1: 5-1 : 18 (volume ratio), pre-mixed with a stirrer, sprayed the mixture onto ballast (roadbed crushed stone) assuming an orbit, pressed the surface lightly to flatten, and formed on ballast (roadbed crushed stone) A ballast sound-absorbing layer having a thickness of 10 mm to 30 mm, after the mixture as the material of the ballast sound-absorbing layer is sprayed on the ballast (roadbed crushed stone) while moving on the orbit at a constant speed with an inclined falling container Providing acoustical engineering process trajectory, characterized in that to form the ballast sound absorption layer by adding an appropriate pressing an upper surface of the ballast backing layer by moving the earth removing plate at a constant speed.
Since it was set as such a structure, in addition to the effect of the invention of Claim 1, the effect that the sound absorption method of an orbit which can make the surface of a mixture flat, eliminating the excessive mixture in the surface of a ballast sound absorption layer can be provided. There is.

Hereinafter, embodiments of the sound absorbing material for the track and the sound absorbing method for the track according to the present invention will be described.
First, examples of the binder resin used in the ballast sound absorbing layer of the present invention include epoxy-based, urethane-based, acrylic-based, and polyester-based polymer resins, which are cured at room temperature and are described below. Various resins can be used without particular limitation as long as they can be bonded and cured. The binder resin is a one-part curable polyurethane resin represented by a moisture curable type, a one-part curable epoxy resin, a vinyl acetate resin, a vinyl chloride resin, an ethylene-vinyl acetate copolymer resin (EVA), an alkyd resin, an acrylic resin. Examples thereof include resins, two-component curable polyurethane resins, two-component curable epoxy resins, styrene-butadiene resins (SBR), chloroprene resins (CR), and styrene-butadiene-styrene block copolymer resins (SBS). In particular, moisture-curable one-component polyurethane resins, one-component curable epoxy resins, and the like can be recommended for the convenience of storage management and construction. Moreover, although it is not resin, it can also be hardened using cement or asphalt.

Next, the inorganic particles used in the ballast sound absorbing layer of the present invention have a particle size of 2.5 mm or less, and seto crushed stone No. 3 (particle size 0.8 to 1.2 mm), peridotite, sandstone G light 2 or a vitreous filler using waste glass raw material can be exemplified as a suitable one. The inorganic particles may be other inorganic particles, for example, crushed stone, Glite No. 1 particle, etc., as long as the particle diameter is 2.5 mm or less. In the case of inorganic particles having a particle diameter of more than 2.5 mm, there is a possibility that a necessary sound absorption coefficient may not be obtained after the construction, and the particle diameter is a particle whose particle size distribution is 70% or more and 2.5 mm or less. It is an essential condition that it is composed of particles having a diameter.

Thus, the above-described binder resin that starts curing after a certain period of time at room temperature and the above-described inorganic particles having a particle diameter of 2.5 mm or less are uniformly mixed and dispersed to form a ballast sound-absorbing layer. Constitute. The mixing ratio of the binder resin and the inorganic particles is preferably mixed at a volume ratio of binder resin: inorganic particles = 1: 5 to 1:18. When the volume ratio of the binder resin is smaller than 1/18 by comparing the binder resin and the inorganic particles, the inorganic particles are not fixed after construction, and the ballast sound absorbing layer may not be formed on the ballast, Conversely, if the volume ratio of the binder resin is greater than 1/5 by comparing the binder resin and the inorganic particles, the air permeability necessary for the ballast sound absorbing layer formed on the ballast after construction cannot be ensured. In some cases, a sufficient sound absorption effect cannot be obtained, and the mixing ratio must be adjusted.

Further, the binder resin and the inorganic particles need to be sufficiently mixed in advance by an appropriate method. There is no particular limitation on the mixing method, and the binder resin and the inorganic particles may be put into a suitable container and mixed with an excavator or a stirrer. At this time, if the mixing of the binder resin and the inorganic particles is insufficient, the density of the ballast sound absorbing layer formed on the ballast becomes non-uniform, and the necessary sound absorbing effect may not be obtained.

Next, the manufacturing procedure of the sound absorbing material for the track and the sound absorbing method for the track according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a standard sectional view showing an example of a track structure according to the present invention.
1 is a sleeper, 2 is a fastening device, and 3 is a rail, which is laid on the sleeper 1 and fixed by the fastening device 2. Ballasts (roadbed crushed stones) 4 are laid on both sides under the sleepers 1. On the ballast (roadbed crushed stone) 4, the ballast sound absorbing layer 5 having the above-described configuration, that is, a mixture of a binder resin and inorganic particles is formed.

FIG. 2 is a standard sectional view showing another example of the structure of the track according to the present invention.
Reference numeral 8 denotes a track slab, and 9 denotes a rail fastening base projecting on the track slab 8. The rail 3 is attached to the upper surface of the rail fastening base 7 by bolts or rail fasteners (not shown). A ballast (roadbed crushed stone) 4 is laid on the track slab 8. On this ballast (roadbed crushed stone) 4, the ballast sound absorbing layer 5 having the above-described configuration, that is, a mixture of a binder resin and inorganic particles is formed.
In the figure, reference numeral 10 denotes a side bank, which is provided on the side of the track slab 8.

Here, the production operation of the ballast sound absorbing layer 5 will be described. The sufficiently mixed mixture of the above-described binder resin and the above-described inorganic particles can be used for the ballast (the road bed) at a place where the sound absorbing work on the track is immediately required. Sprinkle on crushed stone 4). After spraying, in order to form the ballast sound absorbing layer 5 having an average thickness of about 10 mm to 30 mm on the ballast (roadbed crushed stone) 4, the ballast sound absorbing layer 5 of the ballast sound absorbing layer 5 is lightly pressed from above the mixture after spraying. Work to treat the surface flat and smooth. In this case, if the thickness of the ballast sound absorbing layer 5 is less than 10 mm, the surface of the ballast (roadbed crushed stone) 4 cannot be covered with the ballast sound absorbing layer 5, and the ballast (roadbed crushed stone) 4 is partially covered by the ballast sound absorbing material. It may be exposed on the upper surface of the layer 5 and a necessary sound absorbing effect may not be obtained. On the other hand, if the thickness of the ballast sound absorbing layer 5 exceeds 30 mm, an improvement in the sound absorbing effect proportional to the thickness of the ballast sound absorbing layer 5 can hardly be expected, which is disadvantageous in terms of cost. It is necessary to set the thickness appropriately.

There is no particular limitation on the method of spraying the mixture. For example, an inclined drop container (not shown) matched to the ballast (roadbed crushed stone) 4 of the orbit width is produced, and this container is moved on the orbit at a constant speed. If the mixture placed in the inclined drop container is dropped, an inclined drop container (not shown) matched to the ballast (roadbed crushed stone) 4 of the orbit width is produced, and this container is moved on the orbit at a constant speed. On the other hand, if the mixture placed in the inclined dropping container is dropped, the uniform ballast sound absorbing layer 5 can be efficiently formed.

There is no particular limitation on the pressing from the upper surface of the ballast sound absorbing layer 5 and the surface flattening operation after the mixture as the material of the ballast sound absorbing layer 5 is sprayed on the ballast (crushed stone) 4, for example, flattening earth and sand. By moving the earth discharge plate to be moved at a constant speed after the movement of the inclined dropping container described above, by applying an appropriate pressure to the upper surface of the ballast sound absorbing layer 5, the ballast sound absorbing layer 5 having a uniform density is formed, It is possible to flatten the surface of the mixture while eliminating excess mixture on the surface of the ballast sound absorbing layer 5.

Immediately after mixing the binder resin described above and the inorganic particles described above, within the pot life of the binder resin used to start the curing reaction of the binder resin, that is, in the pot life, the subsequent process and sound absorption method of the track It needs to be terminated.
In addition, since it is an essential condition of the present invention that the ballast sound absorbing layer 5 having a constant density and a constant thickness is formed on the ballast (roadbed crushed stone) 4, the construction of the sound absorbing method for the track according to the present invention is performed. It is necessary to avoid the weather during heavy weather.

Thus, the ballast sound absorbing layer 5 as the sound absorbing material for the track according to the present invention is not permanent, and is used when a work such as compacting of the ballast (roadbed crushed stone) 4 is performed in accordance with the track maintenance work. Naturally, the ballast sound absorbing layer 5 is destroyed.
Since the track maintenance work is performed periodically after a certain period of time, the ballast sound absorbing layer 5 as the sound absorbing material according to the present invention is set with the ballast rolling pressure by the track maintenance or immediately after the maintenance work. The ballast sound absorbing layer 5 can be held until the next track maintenance work, and there is no waste.

Next, a sample 1 specification diagram shown in FIG. 3 is used in the case where the mineral particles are used as the study material without using the fixing process with the binder resin, and the rocks, sandstone, seto crushed stone 3 and Glite 8up are used. Based on this, the sound absorption effect of the orbit was verified. A ballast (roadbed crushed stone) 4 is preliminarily spread to a height of about 200 mm on the inner bottom of the measurement container 7 shown in FIG. Behind the ballast (roadbed crushed stone) 4 is an air layer 8. The sound incident direction is an arrow P. According to this verification result, as shown in the graph of FIG. 4, the normal incident sound absorption coefficient for the predetermined frequency (Hz) by the introduction of these study materials is the current (existing) It was found that the sound absorption coefficient was improved by 0.3 to 0.9 as compared with the case of the crushed stone only, and the sound absorption coefficient was improved.

Next, sandstone as inorganic particles is packed in the space between the ballast (roadbed crushed stone) 4, and then a binder resin as a roadbed stabilizer is applied from the surface of the ballast (roadbed crushed stone) 4, and the sound absorption method for the track The sound absorption effect of the orbit was verified for samples 2 and 3 with the prototype specifications.
Here, in the sample 2, sandstone is applied from the surface of the ballast (roadbed crushed stone) 4 spread in the measurement container 7, and thereafter, a stabilizer as a current binder resin is applied.
Sample 3 has the same construction method as Sample 2, but is further formed by laying crushed stone (ballast) having a small particle size in the intermediate layer to form a fall prevention layer.
According to this verification result, as shown in the graph of FIG. 5, a specific frequency, for example, about 200 (Hz), about 315 (Hz) is applied by applying a resin as a stabilizer in both samples 2 and 3. As a result, it was found that a high normal incidence sound absorption coefficient can be obtained.

Next, an orbit in which pretreatment is performed to make the sandstone preliminarily spread in the gaps between the ballasts (roadbed crushed stones) 4 by attaching resin or the like to make it sticky, and the sticky sandstone is spread in the measurement container 7 The sound-absorbing effect of the track was verified for samples 4 to 7 with the specifications of the prototype of the sound-absorbing method.
Here, sample 4 is a cohesive rock, sample 5 is a cohesive rock, sample 6 is a seto crushed stone No. 3 and sample 7 is adhesive. G light 8up, each of which will be studied. According to this verification result, as shown in the graph of FIG. 6, in any of the samples 4 to 7, the normal incident sound absorption rate jumps high (largely) in the vicinity of the frequency 500 (Hz), and a high vertical sound absorption rate is obtained. It has been found.

In order to provide an understanding of the sound absorbing material for tracks and the sound absorbing method for tracks according to the present invention, examples will be described below. Needless to say, the present invention is not limited to the following examples.

As the binder resin, moisture-curing polyurethane resin is used. As the inorganic particles, sandstone is used as the aggregate having an average particle diameter of 2.0 mm. The binder resin: inorganic particles = 1: 6 (volume ratio) is used in advance. For 3 minutes, spray the mixture on ballast (roadbed crushed stone) 4 assuming orbital, lightly press the surface to flatten it, leave it for 24 hours, and average thickness on ballast (roadbed crushed stone) 4 A 20 mm ballast sound absorbing layer 5 was formed.
Thus, as shown in the graph of FIG. 7, it has been found that the sound absorption rate is dramatically improved as compared with the case of the current ballast (roadbed crushed stone) 4 alone.

Using the same binder resin and inorganic particles as in Example 1, the binder resin: inorganic particles = 1: 8 (volume ratio) was previously mixed for 3 minutes with a mixer, and the mixture was ballast assuming an orbit. The ballast sound-absorbing layer 5 having an average thickness of 20 mm was formed on the ballast (roadbed crushed stone) 4 by spraying onto the (roadbed crushed stone) 4 and lightly pressing and flattening the surface and leaving it to stand for 24 hours.
Thus, as shown in the graph of FIG. 8, it was found that the sound absorption rate was dramatically improved as compared with the case of the current ballast (roadbed crushed stone) 4 alone.

As the binder resin, moisture-curing polyurethane resin is used, and as the inorganic particles, a rock as an aggregate having an average particle diameter of 2.0 mm is used, and the binder resin: inorganic particles = 1: 6 (volume ratio), Mix for 3 minutes with premixer, spread the mixture on ballast (roadbed crushed stone) 4 assuming orbit, press lightly to flatten the surface, leave for 24 hours, and average on ballast (roadbed crushed stone) 4 A ballast sound absorbing layer 5 having a thickness of 20 mm was formed.
It has been found that Example 3 can also obtain the same high sound absorption coefficient as Example 1 described above.

Using the same binder resin and inorganic particles as in Example 3, with a binder resin: inorganic particles = 1: 8 (volume ratio), the mixture was mixed for 3 minutes in advance with a Mixer, and the mixture was ballast assuming an orbit. The ballast sound-absorbing layer 5 having an average thickness of 20 mm was formed on the ballast (roadbed crushed stone) 4 by spraying onto the (roadbed crushed stone) 4 and lightly pressing and flattening the surface and leaving it to stand for 24 hours.
It has been found that Example 4 can also obtain the same high sound absorption coefficient as Example 2 described above.

It is a standard sectional view showing an example of an orbital sound absorbing material and an orbital sound absorbing method according to the present invention. It is a standard sectional view showing another example of the sound absorbing material for the track and the sound absorbing method for the track according to the present invention. It is a specification figure of the sample 1 which shows the verification method of the sound absorption effect of the track | orbit which concerns on this invention. It is a graph which shows the sound absorption rate with respect to the frequency (Hz) in the case of the sample 1 which shows the verification method of the sound absorption effect of the track | orbit which concerns on this invention. It is a specification figure of the samples 2 and 3 which show the verification method of the sound absorption effect of the track | orbit concerning this invention. It is a specification figure of the samples 5 thru | or 7 which shows the verification method of the sound absorption effect of the track | orbit which concerns on this invention. It is a graph which shows the sound absorption rate with respect to the frequency (Hz) in Example 1 of the sound-absorbing material of a track | orbit and the sound-absorbing method of a track | orbit concerning this invention. It is a graph which shows the sound absorption rate with respect to the frequency (Hz) in Example 2 of the sound-absorbing material of a track | orbit and the sound-absorbing method of a track | orbit concerning this invention.

1 sleeper 2 fastening device 3 rail 4 ballast (roadbed crushed stone)
5 Ballast sound absorbing layer 6 Measuring container 7 Air layer 8 Track slab 9 Rail fastening base 10 Side bank

Claims (2)

As the binder resin, at least one kind of resin selected from a moisture curable polyurethane resin and a one-component curable epoxy resin is used as an inorganic particle, as an aggregate having a particle diameter of 2.5 mm or less, sandstone, ceto crushed stone 3, Using at least one kind selected from rocks, G light No. 2 and glassy fillers using waste glass raw materials, a stirrer with binder resin: inorganic particles = 1: 5 to 1:18 (volume ratio) The ballast sound absorbing layer having a thickness of 10 mm to 30 mm formed on the ballast (roadbed crushed stone) is formed by spraying the mixture onto the ballast (roadbed crushed stone) assuming the trajectory and pressing the surface lightly to flatten the surface. An orbital sound-absorbing material characterized by being formed. As the binder resin, at least one kind of resin selected from a moisture curable polyurethane resin and a one-component curable epoxy resin is used as an inorganic particle, as an aggregate having a particle diameter of 2.5 mm or less, sandstone, ceto crushed stone 3, Using at least one kind selected from rocks, G light No. 2 and glassy fillers using waste glass raw materials, a stirrer with binder resin: inorganic particles = 1: 5 to 1:18 (volume ratio) In the ballast sound absorbing layer having a thickness of 10 mm to 30 mm formed on the ballast (roadbed crushed stone), the surface is lightly pressed and flattened by spreading on the ballast (roadbed crushed stone) assuming the orbit. Then, after the mixture as the material for the ballast sound absorbing layer is sprayed on the ballast (roadbed crushed stone) by moving it on the orbit at a constant speed with an inclined drop container, the earth removal plate is moved at a constant speed. Acoustical engineering process trajectory, characterized in that to form the ballast sound absorption layer by adding an appropriate pressing an upper surface of the ballast backing layer by.

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